Armors and what they good for, tips for you bros:
Broken armor - useless, no perks. Cannot be repaired. Good for making the game challenging.
Traveler's Attire - great for clearing map fog and tracks artifacts; for exploration, no combat perks.
Samurai Clan warrior- free; reduces damage; best defensive armor in game. When upgraded, increases Jin's survivavility. Great for one on one boss fight.
Ronin attire - increase melee damage, reduces enemy detection, slows down enemy detection even after you leave the grass area; great for stealth fights; no combat perks - not recommended for open combat.
Tadayori's armor - great for ranged combat; increase knocking and reload speed; headshot restores concentration meter. Dont forget to stock up on arrows.
Gosaku's Armor - increase health and stagger damage, killing staggered enemies restores health. Great for open combat.
Kensei armor - increse resolve gains, more damage to ghost weapons, enemies deal less damage to you and takes more damage when ypu use ghost weapons. No defensive perks. Racks up more heals when upgraded and used correctly so it's great for long battles.
Sakai Clan armor - outclassed by other sets but has Stand off perk, great when paired with stand off techniques which allows you to cut up to 5 enemies (situational).
Ghost Armor - reduce enemy detection speed, reduce number of kills needes to enter ghost stance, kills have a chance to terrify nearby enemies. Great in the hands of more experienced players.
Mongol's Commander Armor - increase to health, reduce all damage, disguise while out of combat reducing detection. No stealth perks, cannot be upgraded.
Fundoshi - underwear armor (?), running makes no noise.
Hope this helps.